personal_interest_mirrors/bocker
1
0
Fork 0
mirror of https://github.com/p8952/bocker.git synced 2025-11-08 16:13:59 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Bocker is now written in 'around 100 lines of bash'

Browse Source 
The 100 lines limit was a fun idea but has started to hurt
development. There will still be a focus on keeping it short and simple,
but no hard limit imposed
This commit is contained in:
Peter Wilmott 2015-07-31 18:12:59 +00:00
parent 11129aecc0
commit bc1b4719b5
3 changed files with 37 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
View File

@ -1,5 +1,5 @@
# Bocker
Docker implemented in 100 lines of bash.
Docker implemented in around 100 lines of bash.
* [Prerequisites](#prerequisites)
* [Example Usage](#example-usage)

48
bocker
View File

@ -1,9 +1,13 @@
#!/usr/bin/env bash
set -o errexit -o nounset -o pipefail; shopt -s nullglob
btrfs_path='/var/bocker'; cgroups='cpu,cpuacct,cpuset,memory'; $(cgget -h &> /dev/null) && CGX="cgexec -g $cgroups" || CGX='_='
btrfs_path='/var/bocker'
cgroups='cpu,cpuacct,cpuset,memory'; $(cgget -h &> /dev/null) && CGX="cgexec -g $cgroups" || CGX='_='
function bocker_check() {
btrfs subvolume list "$btrfs_path" | grep -qw "$1" && echo 0 || echo 1
}; function bocker_init() { #HELP Create an image from a directory:\nBOCKER init <directory>
}
function bocker_init() { #HELP Create an image from a directory:\nBOCKER init <directory>
uuid="img_$(shuf -i 42002-42254 -n 1)"
if [[ -d "$1" ]]; then
[[ "$(bocker_check "$uuid")" == 0 ]] && bocker_run "$@"
@ -14,7 +18,9 @@ function bocker_check() {
else
echo "No directory named '$1' exists"
fi
}; function bocker_pull() { #HELP Pull an image from Docker Hub:\nBOCKER pull <name> <tag>
}
function bocker_pull() { #HELP Pull an image from Docker Hub:\nBOCKER pull <name> <tag>
token="$(curl -sL -o /dev/null -D- -H 'X-Docker-Token: true' "https://index.docker.io/v1/repositories/$1/images" | tr -d '\r' | awk -F ': *' '$1 == "X-Docker-Token" { print $2 }')"
registry='https://registry-1.docker.io/v1'
id="$(curl -sL -H "Authorization: Token $token" "$registry/repositories/$1/tags/$2" | sed 's/"//g')"
@ -27,24 +33,32 @@ function bocker_check() {
done
echo "$1:$2" > /tmp/"$tmp_uuid"/img.source
bocker_init /tmp/"$tmp_uuid" && rm -rf /tmp/"$tmp_uuid"
}; function bocker_rm() { #HELP Delete an image or container:\nBOCKER rm <image_id or container_id>
}
function bocker_rm() { #HELP Delete an image or container:\nBOCKER rm <image_id or container_id>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
btrfs subvolume delete "$btrfs_path/$1" > /dev/null
cgdelete -g $cgroups:/$1 &> /dev/null || true
echo "Removed: $1"
}; function bocker_images() { #HELP List images:\nBOCKER images
}
function bocker_images() { #HELP List images:\nBOCKER images
echo -e "IMAGE_ID\t\tSOURCE"
for img in "$btrfs_path"/img_*; do
img=$(basename "$img")
echo -e "$img\t\t$(cat "$btrfs_path/$img/img.source")"
done
}; function bocker_ps() { #HELP List containers:\nBOCKER ps
}
function bocker_ps() { #HELP List containers:\nBOCKER ps
echo -e "CONTAINER_ID\t\tCOMMAND"
for ps in "$btrfs_path"/ps_*; do
ps=$(basename "$ps")
echo -e "$ps\t\t$(cat "$btrfs_path/$ps/$ps.cmd")"
done
}; function bocker_run() { #HELP Create a container:\nBOCKER run <image_id> <command>
}
function bocker_run() { #HELP Create a container:\nBOCKER run <image_id> <command>
uuid="ps_$(shuf -i 42002-42254 -n 1)"
[[ "$(bocker_check "$1")" == 1 ]] && echo "No image named '$1' exists" && exit 1
[[ "$(bocker_check "$uuid")" == 0 ]] && echo "UUID conflict, retrying..." && bocker_run "$@" && return
@ -68,21 +82,31 @@ function bocker_check() {
2>&1 | tee "$btrfs_path/$uuid/$uuid.log" || true
ip link del dev veth0_"$uuid"
ip netns del netns_"$uuid"
}; function bocker_exec() { #HELP Execute a command in an existing container:\nBOCKER exec <container_id> <command>
}
function bocker_exec() { #HELP Execute a command in an existing container:\nBOCKER exec <container_id> <command>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
cmd=${@:2} && cid=$(ps xao ppid,pid,cmd | grep "$(ps -u | grep unshare | grep "$1" | awk '{ print $2 }')" | grep -v unshare | awk '{ print $2 }')
nsenter -t "$cid" -m -u -i -n -p chroot "$btrfs_path/$1" "$cmd"
}; function bocker_logs() { #HELP View logs from a container:\nBOCKER logs <container_id>
}
function bocker_logs() { #HELP View logs from a container:\nBOCKER logs <container_id>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
cat "$btrfs_path/$1/$1.log"
}; function bocker_commit() { #HELP Commit a container to an image:\nBOCKER commit <container_id> <image_id>
}
function bocker_commit() { #HELP Commit a container to an image:\nBOCKER commit <container_id> <image_id>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
[[ "$(bocker_check "$2")" == 1 ]] && echo "No image named '$1' exists" && exit 1
bocker_rm "$2" && btrfs subvolume snapshot "$btrfs_path/$1" "$btrfs_path/$2" > /dev/null
echo "Created: $2"
}; function bocker_help() { #HELP Display this message:\nBOCKER help
}
function bocker_help() { #HELP Display this message:\nBOCKER help
sed -n "s/^.*#HELP\\s//p;" < "$1" | sed "s/\\\\n/\n\t/g;s/$/\n/;s!BOCKER!${1/!/\\!}!g"
}; [[ -z "${1-}" ]] && bocker_help "$0"
}
[[ -z "${1-}" ]] && bocker_help "$0"
case $1 in
pull|init|rm|images|ps|run|exec|logs|commit) bocker_"$1" "${@:2}" ;;
*) bocker_help "$0" ;;

4
tests/test_length
View File

@ -1,4 +0,0 @@
#!/usr/bin/env bash
set -o errexit -o nounset -o pipefail
[[ "$(wc -l < bocker)" -le 100 ]]; echo $?